EP2394425B1 - Optical image stabilisation - Google Patents

Optical image stabilisation Download PDF

Info

Publication number
EP2394425B1
EP2394425B1 EP10702530.6A EP10702530A EP2394425B1 EP 2394425 B1 EP2394425 B1 EP 2394425B1 EP 10702530 A EP10702530 A EP 10702530A EP 2394425 B1 EP2394425 B1 EP 2394425B1
Authority
EP
European Patent Office
Prior art keywords
camera unit
sma
support structure
optical axis
actuators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10702530.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2394425A1 (en
Inventor
Andrew Benjamin David Brown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cambridge Mechatronics Ltd
Original Assignee
Cambridge Mechatronics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB0901987.8A external-priority patent/GB0901987D0/en
Priority claimed from GBGB0908791.7A external-priority patent/GB0908791D0/en
Priority claimed from GB0918294A external-priority patent/GB0918294D0/en
Application filed by Cambridge Mechatronics Ltd filed Critical Cambridge Mechatronics Ltd
Publication of EP2394425A1 publication Critical patent/EP2394425A1/en
Application granted granted Critical
Publication of EP2394425B1 publication Critical patent/EP2394425B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
    • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position

Definitions

  • the present invention relates to optical image stabilisation (OIS) of camera apparatus comprising an image sensor and a lens system for focussing an image on the image sensor.
  • OIS optical image stabilisation
  • OIS The purpose of OIS is to compensate for camera shake, that is vibration of the camera apparatus typically caused by user hand movement, that degrades the quality of the image captured by the image sensor.
  • OIS typically involves detection of the vibration by a vibration sensor such as a gyroscope sensor, and control on the basis of the detected vibration of an actuator system that adjusts the camera apparatus to compensate the captured image for the vibration.
  • One technique typically employed in digital stills cameras is to keep the position of the camera apparatus as a whole fixed (including the image sensor and most of the lens system) and to move one lens group in directions perpendicular to the optical axis. This technique is particularly suitable to large cameras as the lens group is of low size and inertia as compared to the remainder of the camera.
  • An alternative technique is to keep the lens system still, and to move the image sensor in directions perpendicular to the optical axis.
  • US-2006/0272328 teaches that a sufficiently high frequency response can be achieved by reducing the diameter of the SMA wire.
  • a perceived drawback of SMA as an actuator is its slow response time. As the SMA actuator is thermally driven, the response time is limited by the temperature rise and fall of the SMA material, which is associated with its thermal conductivity, specific heat capacity, and its thermal mass.
  • OIS is achieved by tilting the camera unit in directions perpendicular to the optical axis.
  • This is made possible because the size and inertia of the camera unit is small, and is beneficial so as to separate the OIS function from the other camera functions. In particular, it is unnecessary to alter the complex internal design of the camera unit, such as the highly toleranced optical components.
  • SMA as an actuator, there is achieved the advantage of a very high energy density (mechanical energy available for a given mass of material). In other words, this allows the actuator system to be extremely small. Similarly, SMA actuators are able to deliver high forces. Both these factors mean that SMA actuators are highly suited to providing OIS for a miniature camera.
  • the camera apparatus disclosed in US-2006/0272328 suffers from disadvantage of requiring an elastic support member for the camera unit that acts a physical pivot for the tilting.
  • the use of an elastic support member leads to transmission inefficiencies as it is not a true pivot. Replacement by a mechanism providing a true pivot, such as with a ball and socket joint, is difficult and leads to friction and hysteresis.
  • one possible approach would be to provide a different form of suspension for the camera unit that allows movement of the camera unit along the optical axis, for example a plurality of resilient flexures.
  • the elastic support member would no longer be present and hence it would be necessary to provide a biassing force acting against the SMA actuators. This is straightforward to implement, for example using deformation of resilient flexures in a suspension system or by providing a separate biassing element.
  • camera apparatus comprising: a support structure; a camera unit comprising an image sensor and a lens system for focussing an image on the image sensor, the camera unit being supported on the support structure in a manner allowing the camera unit to tilt around two axes that are perpendicular to each other and to the optical axis of the lens system; and an SMA actuator system comprising two SMA actuator subsystems each comprising two SMA actuators disposed on opposite sides of the camera unit, each SMA actuator comprising a piece of SMA wire connected between the camera unit and the support structure, each SMA actuator subsystem being arranged, on differential contraction of the actuators thereof, to drive rotation of the camera unit around a respective one of said two axes that are perpendicular to each other and to the optical axis of the lens system, characterised in that: each SMA actuator comprises a piece of SMA wire connected at both ends to one of the camera unit and the support structure and intermediate its ends hooked over a hook on the other of the camera
  • camera apparatus comprising: a support structure; a camera unit comprising an image sensor and a lens system for focussing an image on the image sensor, the camera unit being supported on the support structure in a manner allowing the camera unit to tilt around two axes that are perpendicular to each other and to the optical axis of the lens system; and an SMA actuator system comprising two SMA actuator subsystems each comprising two SMA actuators disposed on opposite sides of the camera unit and connected between the camera unit and the support structure, each SMA actuator subsystem being arranged, on differential contraction of the actuators thereof, to drive rotation of the camera unit around a respective one of said two axes that are perpendicular to each other and to the optical axis of the lens system, characterised in that: the camera apparatus comprises a suspension system comprising a plurality of flexures connected between the support structure and the camera unit to support the camera unit on the support structure in said manner allowing the camera unit to tilt around two axes that are per
  • Such a camera apparatus allows OIS to be provided by tilting of a camera unit comprising an image sensor and a lens system in directions perpendicular to the optical axis, actuated by the SMA actuators.
  • This allows an OIS function to be achieved with similar advantages to those set out above for US-2006/0272328 and US-2007/0109412 that it is unnecessary to alter the complex internal design of the camera unit and that the apparatus is compact due to the high energy density of SMA.
  • Each SMA actuator subsystem provides tilting around one of the axes perpendicular to the optical axis. As there are at least two actuators in an SMA subsystem, differential contraction thereof causes the camera unit to tilt. Since each SMA actuator delivers linear motion, differential contraction causes a tilting motion of the camera about a pivot point. In this way the two SMA subsystems together may provide the required tilt control in two orthogonal directions.
  • the SMA actuators can be driven with electrical signals to set a balance position away from any mechanism end stops, and in this way the two SMA actuation subsystems collectively define a virtual pivot point for the camera unit around which the tilting driven by either one of the SMA actuator subsystems occurs. In this way the position and attitude of the camera module can be accurately controlled, without the need for a separate fixed pivot provided by a suspension system for the camera unit.
  • the camera unit is provided with a balanced arrangement having a virtual pivot, which can be arbitrarily located, but is desirably located inside the camera unit, and along the optical axis.
  • the virtual pivot point may be located at the centre of mass of the camera unit. Having such control over the pivot point is beneficial, since if a real nonideal pivot is used, it will most simply be located outside the camera unit, for example at the position of the elastic block in the camera apparatus disclosed in US-2006/0272328 , which means that any tilt is accompanied by an undesirable lateral shift of the camera unit relative to the optical axis.
  • the stress can be controlled in response to the ambient temperature.
  • the ability to control the tension in the wires means that the apparatus can be operated with a stress that that increases with ambient temperature. This means that a relatively low tension may be applied to the SMA actuators at low ambient temperatures below the natural transition temperature of the SMA wire, but increasing the tension in the SMA actuators at higher ambient temperatures to allow the full stroke to be achieved.
  • the stress range may be controlled by mimimising the maximum stress experienced by the SMA actuators, while maintaining a high minimum stress in the SMA actuators at high ambient temperatures.
  • the present invention avoids the need to mount the camera unit on the an elastic support member.
  • the two actuator subsystems may themselves suspend the camera unit as they provide forces in opposite directions.
  • a separate suspension system for the camera unit comprises a plurality of flexures.
  • Flexures provide numerous benefits as a suspension system.
  • the flexures may be arranged to provide a low stiffness along the movement axis and a high stiffness perpendicular to the movement axis.
  • flexures experience a minimal degree of friction against movement, as compared for example to a bearing.
  • a suspension system formed by flexures is compact and straightforward to manufacture.
  • the present invention also avoids or at least reduces the requirement for any biassing force to be provided to act against the contraction of the SMA actuators, because each SMA actuator subsystem provides a force opposing contraction of the other.
  • a biassing element may be avoided altogether or, if provided, may be reduced in size as compared to an equivalent system in which all the actuators drive movement of the camera unit in the same direction along the optical axis.
  • the requirement for this to provide a biassing force is reduced, thereby simplifying the design.
  • the present invention solves the problem associated with providing a pivot point, whilst achieving the desire of operating SMA actuators against each other so as to minimise the number and size of the components, and the drive power of the actuators.
  • each SMA actuator comprises a piece of SMA wire connected at both ends to one of the camera unit and the support structure and intermediate its ends connected to the other of the camera unit and the support structure to connect it thereto.
  • the two portions of the piece of SMA wire extending between the camera unit and the support structure may each extend perpendicular to a common line radial of the optical axis. This has the advantage that the SMA actuators do not on contraction apply any resultant force perpendicular to the optical axis.
  • the camera unit further comprises a control circuit electrically connected to the portions of the SMA actuators that are connected to the camera unit for supplying drive signals thereto.
  • a control circuit electrically connected to the portions of the SMA actuators that are connected to the camera unit for supplying drive signals thereto.
  • the SMA actuators comprise hooked pieces of SMA wire in accordance with the first aspect of the present invention
  • they are connected to the camera unit and hooked over the support structure to connect them thereto.
  • This facilitates the making of an electrical connection from the control circuit to the ends of the pieces of SMA wire that are fixed to the camera unit.
  • the pieces of SMA wire are typically fixed to the camera unit by crimping members that crimp the SMA wire, which may conveniently also provide an electrical connection.
  • a vibration sensor arranged to generate output signals representative of the vibration of the camera unit, and in response to which the control circuit generates drive signals.
  • This provides a technical improvement to the quality of the optical image stabilisation.
  • the control algorithm implemented by the control circuit now seeks to minimise the vibrations detected by the vibration sensor rather than to deliver an opposing correction to the tilts sensed. In practice this provides more reliable compensation than if the vibration sensor is mounted on the support structure.
  • FIG. 1 is a cross-sectional view, the cross-section being taken along the optical axis O of the camera apparatus 1.
  • the camera apparatus 1 is to be incorporated in a portable electronic device such as a mobile telephone, media player or portable digital assistant.
  • a portable electronic device such as a mobile telephone, media player or portable digital assistant.
  • the camera apparatus 1 comprises a support structure 2 and a camera unit 10 that is supported on the support structure 2 by a suspension system 20 that is described detail below.
  • the camera apparatus also includes an SMA actuator system 30 connected between the support structure 2 and the camera unit 10, that is also described in detail below.
  • the camera unit 10 is a functional camera and comprises an image sensor 11 and a lens system 12, both supported on a camera support 13.
  • the camera unit 10 has a printed circuit board (PCB) 14 on its bottom surface to which the image sensor 11 is mounted and connected.
  • the lens element 12 and the image sensor 11 are arranged along the optical axis O so that the lens system 12 focuses an image onto the image sensor 11.
  • the image sensor 11 captures the image and may be of any suitable type for example a CCD (charge-coupled device) or a CMOS (complimentary metal-oxide-semiconductor) device.
  • the camera unit 1 is a miniature camera having one or more lenses with a diameter of at most 10 mm.
  • the camera unit 10 may be a functionally standard camera.
  • the camera unit 10 may have any desired construction to provide the desired optical performance, irrespective of the OIS function.
  • the camera unit 10 may include a lens system 12 comprising a single lens or plural lenses as needed to provide the desired balance of optical performance and cost.
  • the lens system 12 may provide a fixed focus or a variable focus.
  • the camera unit 10 may employ any suitable construction for varying the focus, including the use of an SMA actuator system.
  • the camera unit 10 may be a camera of the type described in WO-2007/113478 , WO-2008/099156 or WO-2009/056822 .
  • the suspension system 20 comprises a set of flexures 21 each connected between the support structure 2 and the camera unit 10 to support the camera unit 10 on the support structure 2.
  • the flexures 21 are arranged as beams having a greater width as viewed along the optical axis O than thickness as viewed perpendicular to the optical axis O to allow deflection along the optical axis O while resisting movement perpendicular to the optical axis O.
  • the flexures 21, upon deflection thereof allow movement of the camera unit 10 along the optical axis O and also tilting of the camera unit 10 around two axes that are perpendicular to each other and to the optical axis O.
  • Such tilting around two perpendicular axes in general allows tilting of the camera unit 10 about any arbitrary axis perpendicular to the optical axis O.
  • the flexures 21 may have a variety of arrangements but are typically spaced symmetrically around the camera unit 10 to provide similar stiffness against motion in different directions perpendicular to the optical axis O.
  • the suspension system 20 allows tilting of the camera unit 10 around a axis that is perpendicular to the optical axis O, upon differential deflection of the flexures 21 arranged on opposite sides of the camera unit 10.
  • the entire suspension system 20 consisting of all the flexures 21 may be formed from a single piece of material, typically a metal, although each of the flexures 21 could equally be formed as a separate element.
  • flexures 21 as compared to other types of suspension system provides advantages, in particular being compact and straightforward to manufacture whiles providing a low stiffness along the optical axis O and a high stiffness in perpendicular directions. Similarly, the flexures 21 experience a minimal degree of friction against movement as compared to other suspension systems, for example a bearing.
  • the suspension system 20 is optional in that the camera unit 10 could alternatively be supported solely by the SMA actuator system 30 that will now be described.
  • the camera unit 10 has no restraints on its movement except as imposed by the SMA actuator system 30 and so the camera unit 10 remains able to tilt around two axes perpendicular to the optical axis O, that is upon actuation of the SMA actuation system 30 as described below.
  • FIG. 2 is a perspective view of the camera apparatus 1 with the support structure 2 and suspension system 20 omitted for clarity.
  • the camera unit 10 is square as viewed along the optical axis O.
  • the SMA actuator system 30 comprises four SMA actuators 31 arranged as follows. Two of the actuators 31 are visible in Fig. 2 , there being two more actuators 31 on the opposite sides of the camera unit 10 that are mirror images the two actuators 31 that can be seen, in perpendicular planes through the optical axis O.
  • Each SMA actuator 31 comprises a piece of SMA wire 32 mounted between two crimping members 33 that crimp the piece of SMA wire 32 at each end, thereby providing a mechanical terminal.
  • the crimping members 33 are each fixed to the camera support 13 to provide mechanical connection of the SMA actuator 31 to the camera unit 10, possibly via an intermediate component (not shown) depending on the chosen assembly method and manufacturing philosophy.
  • This mounting may be achieved by a mechanical fitting, strengthened by the use of adhesive.
  • this mounting may be achieved by some kind of heat staking process if the camera support 13 is made from polymer material and has suitable heat deformable features to retain the crimping members 33.
  • each SMA actuator 31 is located at opposite ends of a respective side of the camera unit 10 so that the piece of SMA wire 32 extends along a side of the camera unit 10 perpendicular to a line radial of the optical axis O.
  • the crimping members 33 provide electrical connections to the piece of SMA wire 32, allowing a drive current to be supplied through the piece of SMA wire 32.
  • the crimping members 33 are electrically connected to the PCB 14 on the lowermost side of the camera unit 10, for example by being soldered to appropriate pads provided on the PCB 14.
  • the PCB 14 mounts an integrated circuit (IC) chip 40 in which is implemented a control circuit 42, described further below, for generating drive signals for supply to the SMA actuators 31 via the PCB 14.
  • the control circuit 42 is electrically connected to the portions of the SMA actuators 31 that are connected to the camera unit 10. This simplifies the overall camera apparatus 1 because both the control circuit 42 and the image sensor 11 are mounted in the camera unit 10 to the PCB 14 which simplifies the making of electrical connections thereto.
  • the PCB 14 also mounts a gyroscope sensor 41 that outputs a signal representative of the angular velocity of the camera unit 10, thereby acting as a vibration sensor that detects the vibrations that the camera unit 10 is experiencing.
  • the gyroscope sensor 41 is typically a pair of miniature gyroscopes, for detecting vibration around two axes perpendicular to each other and the optical axis, although in general larger numbers of gyroscopes or other types of vibration sensor could be used.
  • the control circuit 42 in the IC chip 40 is supplied with the output signals from the gyroscope sensor 41 and generates the drive signals on the basis thereof, as described in more detail below.
  • Provision of the gyroscope sensor 41 on the camera unit 10 rather than the support structure 2 improves the quality of the OIS because the control algorithm seeks to minimise the detected vibrations rather than to deliver an opposing correction to the sensed tilt of the support structure 2. Furthermore the overall camera apparatus 1 is simplified because, in addition to the control circuit 42 and the image sensor 11, the gyroscope sensor 41 is also mounted in the camera unit 10 to the PCB 14 so electrical connections to all these components are easily made.
  • each piece of SMA wire 32 of each SMA actuator 31 is hooked over a respective hook 34 (shown in dotted outline) which is part of the support structure 2.
  • each piece of SMA wire 32 extends between the camera unit 10 and the support structure 2 at an acute non-zero angle to the optical axis O.
  • the piece of SMA wire 32 is held in tension, thereby applying a component of force in a direction along the optical axis O.
  • the two portions of the piece of SMA wire 32 extending between the camera unit 10 and the support structure 2 on either side of the hook 34 each extend perpendicular to a common line radial of the optical axis O, as a result of the SMA wire 32 being arranged along a side of the camera unit 10.
  • there is no component of force perpendicular to the optical axis O which is advantageous in that the SMA actuators 31 do not apply sideways forces to the camera unit 10.
  • each of the pairs of actuators 32 arranged opposite one another are arranged so that this component of force is applied in a different direction. That is, the SMA wires 32 of one pair of actuators 31 extend upwardly (as shown in Fig. 2 ) from the crimping members 34 to the hook 34 and thereby apply a component of force to the camera unit 10 in the direction A upwardly, whereas the SMA wires 32 of the other pair of actuators 31 extend downwardly (as shown in Fig. 2 ) from the crimping members 34 to the hook 34 and thereby apply a component of force to the camera unit 10 in the opposite direction B downwardly.
  • the pairs of SMA actuators 31 will therefore be referred to as respective SMA actuator subsystems 35 of the SMA actuator system 30.
  • SMA material has the property that on heating it undergoes a solid-state phase change which causes the SMA material to contract. At low temperatures the SMA material enters the Martensite phase. At high temperatures the SMA enters the Austenite phase which induces a deformation causing the SMA material to contract. The phase change occurs over a range of temperature due to the statistical spread of transition temperature in the SMA crystal structure. Thus heating of the piece of SMA wire 32 causes it to decrease in length.
  • the position of the camera unit 10 relative to the support structure 2 along the optical axis O is controlled by varying the temperature of the SMA actuators 31. This is achieved by passing through the SMA actuator 31 a drive current that provides resistive heating. Heating is provided by the drive current. Cooling is provided by reducing or ceasing the drive current to allow the SMA actuator 31 to cool by conduction to its surroundings.
  • the degree of displacement achievable along the optical axis O is dependent on the strain developed within the SMA actuator 31 and also on the acute angle of the piece of SMA wire 32 extending between the camera unit 1 and the support structure 2 with respect to the optical axis O.
  • the strain which may be developed in the SMA wire 32 is limited by the physical phenomenon of the phase change. Due to the SMA wire 32 extending at an acute non-zero angle to the optical axis O, the SMA wire 32 changes in orientation when it changes in length. This effectively gears the movement so that the degree of displacement along the optical axis O is higher than the change in length of the SMA wire resolved along the optical axis O.
  • the SMA wire 32 may be made of any suitable SMA material, for example Nitinol or another Titanium-alloy SMA material.
  • the material composition and pre-treatment of the piece of SMA wire 32 is chosen to provide phase change over a range of temperature that is above the expected ambient temperature during normal operation and as wide as possible to maximise the degree of positional control.
  • the SMA actuators 31 of the respective SMA actuator subsystems 35 on contraction, drive displacement of the camera unit 10 in opposite directions along the optical axis O. Accordingly, the respective SMA actuator subsystems 35 apply a stress to each other. This stress can be controlled by varying the heating of the SMA actuators 31.
  • the drive signals applied to the actuators 31 includes a common component that is common to both respective SMA actuator subsystems 35. Varying the level of the common component varies the stress in the actuators 31. This provides active control of the stress cycle of the SMA actuators 31.
  • the camera apparatus 1 is configured to develop a relatively high stress in the SMA actuators 31, whilst minimising the stress range.
  • a high stress raises the temperature at which the stress in the SMA material is sufficient to cause contraction.
  • the common component may therefore be varied in response to the ambient temperature, being increased with increasing ambient temperature.
  • Minimising the stress range also has the effect of minimising the drive power required to change the phase of the SMA actuator 31 and allow it to contract.
  • the SMA actuators 31 of each SMA actuator subsystem 35 on differential contraction, drive rotation of the camera unit 10 around respective axes perpendicular to each other and to the optical axis O.
  • the actuators 31 of the SMA actuator system 30 as a whole may be driven to provide tilting about any arbitrary axis perpendicular to the optical axis O.
  • the configuration of the SMA actuator system 30 creates the desired virtual pivot for the camera unit 10 by operating all the SMA actuators 30 with a controlled drive signal.
  • the drive signals applied to the SMA actuators 31 of each SMA actuator subsystem 35 include a differential component selected to provide the desired tilt around the respective axis. These differential component may be modified by various compensation algorithms to compensate for non-linear effects such as hysteresis in the SMA material.
  • the differential component may be applied in any manner. Most conveniently, the differential component may be generated based on a measurement of the resistance of the SMA actuators 31. With this approach a target resistance for each SMA actuator 31 may be varied differentially for each SMA actuator 31 (i.e. increasing in one SMA actuator 31 so that heating is demanded when decreasing in the other SMA actuator 31 so that cooling is demanded, and vice versa), and then the drive signal of each SMA actuator 31 may be varied independently to drive the measured resistance to the target resistance. This will have the effect of a differential component being applied as between the two SMA actuators 31.
  • the differential component may be applied for the SMA actuator subsystem 35 as a whole and then applied to the two SMA actuators 31 thereof, for example bing applied inversely to both SMA actuators 31 or being applied to just one of the SMA actuators 31.
  • the SMA actuators 31 may be driven to provide tilting with a high degree of positional control, as a result of the suspension system 20 allowing the camera unit 10 to move along the optical axis O and the SMA actuators 31 driving displacement along the optical axis O.
  • OIS is achieved by tilting of the camera unit 10 as a whole, this has the advantage that by separating the OIS function from the other camera functions the internal design of the camera unit 10 is unaffected. This is particularly straightforward in the case of a miniature camera unit 10 because of its small size and inertia.
  • SMA material as an actuator technology is its very high energy density (mechanical energy available for a given mass of material). This allows the SMA actuators 31 and associated mechanisms to be extremely small, and in particular vertically compact, with the result that only a small increase in size of the camera apparatus 1 is needed to provide OIS. The SMA actuators 31 are also able to deliver high forces. Both these factors make SMA highly suited to providing the actuator for an OIS system for a miniature camera unit 10.
  • the SMA actuators 31 may be provided with a sufficient speed of response to provide OIS.
  • each SMA actuator 31 is proportionally driven so as to control the position over a frequency bandwidth up to 10Hz, up to 20Hz, or up to 30Hz.
  • a perceived drawback of SMA as an actuator is its slow response time. As an SMA actuator 31 is thermally driven, the response time is limited by the temperature change achievable, being associated with thermal conductivity, specific heat capacity, and thermal mass.
  • heating of the SMA wire can be increased by increasing the power of the drive current
  • cooling is dependent on the thickness of the piece of SMA wire 32. This thickness is selected to provide the desired response time during cooling. For example, if the SMA wire 32 is of thickness 25 ⁇ m, being currently the thinnest available commercial material, the thermal response begins to roll off at 4Hz. Based on analysis of the OIS function, the functional requirement is to provide movement compensation over a bandwidth of up to 30Hz. However, the amplitude of response required drops markedly over the operating bandwidth, so as to only require less movement (say less than 10 ⁇ m at over 20Hz).
  • the SMA wire 32 is still able to deliver the displacement requirements at 30Hz, and so the SMA actuators 31 are able to successfully meet the actuation requirements of the OIS for miniature cameras.
  • FIG. 3 is a perspective view of the camera apparatus 1 similar to that of Fig. 2 .
  • the second arrangement is the same as the first arrangement except that the four SMA actuators 31 are arranged at different positions around the camera unit 10.
  • the SMA actuators 31 are still formed as a piece of SMA wire 32 hooked over a respective hook 34 (shown in dotted outline) which is part of the support structure 2, and are arranged as two SMA actuator subsystems 35 that are functionally the same as those of the first arrangement.
  • the hook 34 is central on a side of the camera unit 10 so that the portions of the SMA wire 32 on each side of the hook 34 extending along the same side of the camera unit 10
  • the hook 34 is arranged in a corner of the camera unit 10 so that the portions of the SMA wire 32 on each side of the hook 34 extend along adjacent sides of the camera unit 10.
  • these portions of the SMA wire 32 extend at 90° to each other and at 45° to a common line radial of the optical axis O.
  • Such an advantage may be achieved more generally by arranging the SMA actuators with any angle of less than 90° to a common line radial of the optical axis O.
  • each actuator 31 generates a component of force perpendicular to the optical axis O.
  • this lateral force potentially generates a tilt of the camera unit 10.
  • the common component of the drive signals generates lateral forces in the opposing SMA actuators 31 of each SMA actuator subsystem 35 that balance each other, so differential lateral forces are only generated by the differential components of the drive signals.
  • the suspension system 20 is designed to be sufficiently stiff to resist such lateral forces.
  • the SMA actuators 34 may be fixed to the support structure 2 at each end of the piece of SMA wire 32 and hooked over a hook 34 provided on the camera unit 10.
  • the control circuit 42 for generating the drive signals for the SMA actuators 31 is shown in Fig. 4 and will now be described.
  • the control circuit 42 comprises an SMA tilt controller 43 that is supplied with the output signal of the gyroscope sensor 41 and in response thereto generates a tilt control signal in respect of each SMA actuator 31.
  • the SMA tilt controller 43 may be implemented in a processor and generates the tilt control signals in accordance with a control algorithm.
  • the tilt control signals are representative of the degree of actuation required from the respective SMA actuators 31 to compensate for the vibration represented by the output signal of gyroscope sensor 41.
  • the tilt control signals for a pair of opposing SMA actuators 31 are generated to provide a differential displacement providing the required degree of tilt around the corresponding axis perpendicular to the optical axis O. Effectively this means that the difference between the tilt control signals is representative of the demanded angle of tilt around that axis.
  • the gyroscope sensor 41 is aligned to provide two output signals representative of the tilt around perpendicular axes aligned with the axes around which each pair of opposed SMA actuators 31 is capable of tilting the camera unit 10.
  • the tilt control signals for each pair of opposed SMA actuators 31 is derived from a single one of the output signals.
  • the tilt control signals for each pair of opposed SMA actuators 31 is derived from a linear combination of the output signals.
  • the SMA tilt controller 43 generates tilt control signals providing a demanded angle of tilt reduces the actual tilt as measured by the gyroscope sensor 41. In practical terms, this means that it is easier to provide more accurate compensation than if the gyroscope sensor 41 were mounted on the support structure 2 by applying proportional control of the SMA actuators 31 in the drive circuits 45 with a high gain between the output of the gyroscope sensor 31 and the SMA actuators 31.
  • the gyroscope sensor 41 may be mounted on the support structure 2.
  • the output signals are representative of the vibration of the support structure 2.
  • Such vibration will always be present and OIS is effected by tilting the camera unit 10 in opposition.
  • the SMA tilt controller 43 generates control signals providing a demanded angle of tilt which is opposite to the actual tilt as measured by the gyroscope sensor 41.
  • the control circuit 42 also comprises a stress controller 44 that generates a stress control signal that is supplied in common to each SMA actuator 31.
  • the stress control signal represents the desired stress in the SMA actuators 31 and may be varied in response to the ambient temperature, that itself may be determined by a temperature sensor (not shown) or from measured electrical parameters of the SMA actuators 31.
  • Each SMA actuator 31 has a respective drive circuit 45 that is supplied with the common stress control signal and the respective tilt control signal, that generates a drive signal in accordance therewith and that supplies the drive signal to the SMA actuator 31.
  • the drive circuits 45 have identical arrangement as shown in Fig. 5 .
  • the drive circuit 45 includes a combination circuit 46 that combines the received stress control signal and tilt control signal to generate an overall drive signal representative of a target resistance for the SMA actuator controlled by the respective drive circuit 45. In the simplest case , this may be done simply by summing the received stress control signal and tilt control signal, with appropriate scaling. For greater accuracy, the overall control signal may be modified by a compensation algorithm to compensate for non-linear effects.
  • the drive circuit 45 also includes a drive controller 47 that is supplied with the overall control signal from the combination circuit 46 and controls a driver 48 using resistance feedback.
  • the drive controller 47 may be implemented in a processor. Although the SMA tilt controller 43, the stress controller 44 and the drive controllers 45 are illustrated as separate components of ease understanding, they may be implemented in a common processor.
  • the driver 48 is connected to supply the drive current to the SMA actuator 31.
  • the driver 48 may be a constant-voltage current source or a constant-current current source.
  • the constant current might be of the order of 120mA.
  • the drive circuit 45 further includes a detection circuit 49 arranged to detect the resistance of the SMA actuator 31.
  • the detection circuit 49 may be a voltage detection circuit operable to detect the voltage across the SMA actuator 31 which is a measure of the resistance of the piece of SMA wire 32.
  • the detection circuit 49 may be a current detection circuit.
  • the detection circuit 49 may comprise a voltage detection circuit and a current detection circuit operable to detect both the voltage and current across the SMA actuator and to derive a measure of resistance as the ratio thereof.
  • the drive controller 47 is arranged to control the driver 48 to supply a pulse-width modulated current.
  • the drive controller 47 receives the resistance measured by the detection circuit 49 and uses it as a feedback signal in a closed-loop control algorithm to control the PWM duty cycle of the driver 48 to actuate the SMA actuator 31 in accordance with the demand represented by the overall control signal.
  • the closed-loop control may be proportional.
  • the contraction and expansion of the SMA material is approximately linear with its electrical resistance.
  • This variance can be reduced in a number of ways.
  • one convenient approach is to encapsulate the accuracy error of the SMA actuators 31 is to consider it as an error in the SMA drive control gain, for example the gain between the displacement of each SMA actuator 31 and its electrical resistance.
  • the change in position that corresponds to a specific (quasi-linear) change in resistance corresponds to the gain, and hence all the errors can be considered as an error in this gain.
  • This gain may be calibrated for individual camera apparatuses 1 during manufacture on the basis of measurements of the displacement of the actuators 31.
  • Another approach is to dispose the gyroscope sensor 41, or other vibration sensor, on the camera unit 10, so that they sense the actual vibration of the camera unit 10. This provides a number of advantages.
  • the aim of the OIS control algorithm becomes minimising the vibrations detected by the gyroscope sensor 41, rather than delivering an opposing correction to the detected tilt.
  • the output signals of the gyroscope sensor 41 senses the actual vibrations irrespective of whether the camera vibrations are due to a base excitation of the system, such as user handshake, or due to errors in the accuracy of the SMA control gain.
  • optimise the gain of the SMA actuator 31 to minimise the tilt sensed by the gyroscope sensor 41.
  • the control circuit 42 has an adjustable gain and is arranged to adjust its gain to minimise the sensed vibrations. The overall gain may be adjusted by adjustment of the gain of the SMA tilt controller 43 and/or the drive controller 47
  • the gyroscope sensor 41 can be mounted on the same PCB 14 as used to mount the image sensor 11, which is convenient for electrical connections, and also provides a convenient place to mount the control circuit 42.
  • An alternative scheme is to use a dedicated calibration routine in which the control circuit 42 demands a deliberate vibration from the SMA actuators 31, and the induced vibrations are then sensed by the gyroscope sensor 41, and so the actual tilt vibrations can be assessed. Based on the output signals of the gyroscope sensor 41, the gain is adjusted until the demanded tilts match the measured tilts. This scheme assumes the base excitation vibrations can be ignored or deconvolved from the sensed vibrations.
  • each one can have a variable gain that can be separately optimised as part of the algorithm described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)
EP10702530.6A 2009-02-09 2010-01-29 Optical image stabilisation Active EP2394425B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB0901987.8A GB0901987D0 (en) 2009-02-09 2009-02-09 Opposing wires
GBGB0908791.7A GB0908791D0 (en) 2009-05-21 2009-05-21 SMA actuator
GB0918294A GB0918294D0 (en) 2009-10-19 2009-10-19 Optical image stabilisation
PCT/GB2010/000154 WO2010089529A1 (en) 2009-02-09 2010-01-29 Optical image stabilisation

Publications (2)

Publication Number Publication Date
EP2394425A1 EP2394425A1 (en) 2011-12-14
EP2394425B1 true EP2394425B1 (en) 2017-05-31

Family

ID=41801259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10702530.6A Active EP2394425B1 (en) 2009-02-09 2010-01-29 Optical image stabilisation

Country Status (4)

Country Link
US (1) US8570384B2 (ja)
EP (1) EP2394425B1 (ja)
JP (1) JP5702735B2 (ja)
WO (1) WO2010089529A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109416498A (zh) * 2016-08-08 2019-03-01 剑桥机电有限公司 双照相机设备
CN110865499A (zh) * 2018-08-28 2020-03-06 三星电机株式会社 相机模块
CN111752068A (zh) * 2019-03-28 2020-10-09 日本电产三协株式会社 带抖动修正功能的光学单元
CN111835942A (zh) * 2019-04-23 2020-10-27 华为技术有限公司 一种摄像头驱动装置、摄像头模组及移动终端

Families Citing this family (115)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2326984A2 (en) 2008-09-12 2011-06-01 Cambridge Mechatronics Limited Optical image stabilisation comprising shape memory alloy actuators
GB0919640D0 (en) * 2009-11-10 2009-12-23 Cambridge Mechatronics Ltd Optical image stabilisation
WO2011104518A1 (en) 2010-02-26 2011-09-01 Cambridge Mechatronics Limited Sma actuation apparatus
CN103168264B (zh) 2010-08-09 2015-10-14 剑桥机电有限公司 摄像装置
WO2012038703A2 (en) 2010-09-22 2012-03-29 Cambridge Mechatronics Limited Optical image stabilisation
GB201019532D0 (en) 2010-11-18 2010-12-29 Cambridge Mechatronics Ltd Optical image stablisation drive
TWI446690B (zh) * 2011-03-02 2014-07-21 Largan Precision Co Ltd 致動器
US8817116B2 (en) * 2011-10-28 2014-08-26 Lg Innotek Co., Ltd. Camera module
KR101354775B1 (ko) * 2011-12-23 2014-01-22 삼성전기주식회사 카메라 모듈
JPWO2013118601A1 (ja) * 2012-02-07 2015-05-11 コニカミノルタ株式会社 駆動装置およびレンズユニット
WO2013121225A1 (en) 2012-02-16 2013-08-22 Cambridge Mechatronics Limited Shape memory alloy actuation apparatus
US8842215B2 (en) * 2012-03-14 2014-09-23 Apple Inc. Electronic device with shape memory devices
GB201206490D0 (en) 2012-04-12 2012-05-30 Cambridge Mechatronics Ltd Compact camera
KR101932795B1 (ko) 2012-05-25 2018-12-26 캠브리지 메카트로닉스 리미티드 형상 기억 합금 작동 장치
TWI548929B (zh) * 2012-07-30 2016-09-11 鴻海精密工業股份有限公司 影像穩定器及取像裝置
KR101961478B1 (ko) * 2012-09-19 2019-03-22 엘지이노텍 주식회사 카메라 모듈
GB201220485D0 (en) 2012-11-14 2012-12-26 Cambridge Mechatronics Ltd Control of an SMA actuation apparatus
GB201221306D0 (en) 2012-11-27 2013-01-09 Cambridge Mechatronics Ltd Suspension system for a camera lens element
KR20150135248A (ko) 2013-03-06 2015-12-02 콩스베르그 오토모티브 아베 형상 기억 합금 부재를 구비한 유체 라우팅 장치
WO2015005018A1 (ja) * 2013-07-10 2015-01-15 コニカミノルタ株式会社 レンズ駆動装置、および撮像装置
KR102284277B1 (ko) * 2013-09-12 2021-08-02 캠브리지 메카트로닉스 리미티드 소형 카메라 내의 절연된 sma 액추에이터 와이어
KR102244153B1 (ko) 2013-09-13 2021-04-23 엘지이노텍 주식회사 카메라 모듈
US10362303B2 (en) * 2013-12-03 2019-07-23 Apple Inc. Sensor-assisted autofocus calibration
JP2015114484A (ja) * 2013-12-11 2015-06-22 シャープ株式会社 カメラモジュール
WO2015086089A1 (en) 2013-12-13 2015-06-18 Kongsberg Automotive Ab Sma valve for controlling pressurized air supply to an air cell in a vehicle seat
DE112013007678T5 (de) 2013-12-13 2016-09-15 Kongsberg Automotive Ab SMA-Ventil zur Steuerung von Druckluftzufuhr zu einer Luftzelle in einem Fahrzeugsitz
DE112013007682T5 (de) 2013-12-13 2016-09-22 Kongsberg Automotive Ab SMA-Ventil zur Steuerung der Luftzufuhr zu einer Luftzelle in einem Fahrzeugsitz
US9210306B1 (en) * 2014-05-31 2015-12-08 Apple Inc. Method and system for a single frame camera module active alignment tilt correction
DE112014006722T5 (de) 2014-06-04 2017-03-02 Kongsberg Automotive Ab SMA-Ventil zur Steuerung der Druckluftzufuhr zu einer Luftzelle in einem Fahrzeugsitz
US20170299732A1 (en) * 2014-09-17 2017-10-19 The Trustees Of The University Of Pennsylvania Apparatus and methods for measuring delivered ionizing radiation
US10038850B2 (en) * 2014-09-23 2018-07-31 Texas Instruments Incorporated Optical image stabilization (OIS) with compensation for component misalignment
US9778480B2 (en) * 2014-09-26 2017-10-03 Intel Corporation Techniques for optical image stabilization using magnetic shape memory actuators
US9366879B1 (en) * 2014-12-02 2016-06-14 Hutchinson Technology Incorporated Camera lens suspension with polymer bearings
US9416878B1 (en) 2015-02-16 2016-08-16 Kongsberg Automotive, Inc. Valve including a shape memory alloy member
US9454016B1 (en) 2015-03-06 2016-09-27 Hutchinson Technology Incorporated Camera lens suspension with integrated electrical leads
KR101638628B1 (ko) 2015-03-06 2016-07-12 서울과학기술대학교 산학협력단 카메라의 영상 안정화 장치
JP6637516B2 (ja) 2015-04-02 2020-01-29 ハッチンソン テクノロジー インコーポレイテッドＨｕｔｃｈｉｎｓｏｎ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃｏｒｐｏｒａｔｅｄ カメラレンズサスペンション用ワイヤ供給及び取り付けシステム
KR102272706B1 (ko) * 2015-05-05 2021-07-05 액추에이터 솔루션스 게엠베하 틸트 모듈 부조립체 및 그것을 포함하는 광학 영상 안정장치
KR101664468B1 (ko) 2015-07-21 2016-10-11 서울과학기술대학교 산학협력단 진동의 보상을 통한 영상 안정화 방법
GB201517202D0 (en) 2015-09-29 2015-11-11 Cambridge Mechatronics Ltd OIS actuator improvements
WO2017072525A1 (en) 2015-10-28 2017-05-04 Cambridge Mechatronics Limited Camera assembly providing optical image stabilisation
GB201602100D0 (en) 2016-02-05 2016-03-23 Cambridge Mechatronics Ltd Opposing SMA Wire Autofocus
CN107277304B (zh) * 2016-04-01 2020-11-20 台湾东电化股份有限公司 摄像模块及其控制方法
TWI618949B (zh) 2016-04-01 2018-03-21 台灣東電化股份有限公司 鏡頭驅動機構及其控制方法
JP6876481B2 (ja) * 2016-04-01 2021-05-26 台湾東電化股▲ふん▼有限公司 レンズ駆動機構およびその制御方法
US10670878B2 (en) 2016-05-19 2020-06-02 Hutchinson Technology Incorporated Camera lens suspensions
GB201610039D0 (en) * 2016-06-08 2016-07-20 Cambridge Mechatronics Ltd Dynamic centring of SMA actuator
JP6923563B2 (ja) 2016-06-09 2021-08-18 ハッチンソン テクノロジー インコーポレイテッドＨｕｔｃｈｉｎｓｏｎ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃｏｒｐｏｒａｔｅｄ サスペンションアセンブリについての接着剤を有する形状記憶合金ワイヤ取付構造体
KR101938273B1 (ko) * 2016-07-01 2019-01-15 자화전자(주) 광학기기용 회동 구동장치 및 이를 구비하는 카메라 모듈
EP3472665B1 (en) 2016-07-22 2021-11-10 Cambridge Mechatronics Limited Pwm shielding in a camera
JP2020515881A (ja) * 2016-12-16 2020-05-28 ハッチンソン テクノロジー インコーポレイテッドＨｕｔｃｈｉｎｓｏｎ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃｏｒｐｏｒａｔｅｄ 光学画像安定化サスペンションにおけるセンサシフト構造
KR102618376B1 (ko) * 2016-12-28 2023-12-28 삼성전자주식회사 광학 이미지 안정화 기능을 제공하는 카메라 모듈 및 이를 포함하는 전자 장치
GB201703356D0 (en) 2017-03-02 2017-04-19 Cambridge Mechatronics Ltd SMA actuator for zoom camera OIS
GB201707233D0 (en) 2017-05-05 2017-06-21 Cambridge Mechatronics Ltd SMA Actuator with position sensors
US11333134B2 (en) 2017-05-05 2022-05-17 Hutchinson Technology Incorporated Shape memory alloy actuators and methods thereof
US11815794B2 (en) 2017-05-05 2023-11-14 Hutchinson Technology Incorporated Shape memory alloy actuators and methods thereof
WO2018204888A1 (en) 2017-05-05 2018-11-08 Hutchinson Technology Incorporated Shape memory alloy actuators and methods thereof
US11306706B2 (en) 2017-05-05 2022-04-19 Hutchinson Technology Incorporated Shape memory alloy actuators and methods thereof
US11448853B2 (en) 2017-05-05 2022-09-20 Hutchinson Technology Incorporated Shape memory alloy actuators and methods thereof
CN113589545B (zh) * 2017-05-05 2023-11-21 哈钦森技术股份有限公司 形状记忆合金致动器及其方法
EP3625455A1 (en) 2017-05-17 2020-03-25 Cambridge Mechatronics Limited Electrical connections for sma actuators
GB201713191D0 (en) 2017-08-17 2017-10-04 Cambridge Mechatronics Ltd SMA Actuator assembly
GB201717858D0 (en) 2017-10-30 2017-12-13 Cambridge Mechatronics Ltd SMA 2-wire OIS, continuous wiring
GB201717855D0 (en) 2017-10-30 2017-12-13 Cambridge Mechatronics Ltd SMA actuator bearings
WO2019109929A1 (zh) * 2017-12-08 2019-06-13 宁波舜宇光电信息有限公司 光学组件、摄像模组和具有摄像模组的智能设备
CN109901275B (zh) * 2017-12-08 2021-05-18 宁波舜宇光电信息有限公司 在光学组件上缠绕sma线的方法
CN109901347B (zh) * 2017-12-08 2020-12-11 宁波舜宇光电信息有限公司 光学组件、摄像模组和具有摄像模组的智能设备
US11550117B2 (en) 2017-12-23 2023-01-10 Huawei Technologies Co., Ltd. Lens position adjustment device, camera module, information device, and camera driving method
CN110032024B (zh) * 2018-01-12 2024-02-02 宁波舜宇光电信息有限公司 光学致动器及相应的摄像模组和摄像模组阵列
EP3739383B1 (en) * 2018-01-12 2023-05-10 Ningbo Sunny Opotech Co., Ltd. Optical actuator, and corresponding camera module and camera module array
GB2574871A (en) 2018-06-21 2019-12-25 Cambridge Mechatronics Ltd Shape memory alloy actuation apparatus
CN112292528A (zh) 2018-06-21 2021-01-29 剑桥机电有限公司 形状记忆合金致动装置
GB2574869B (en) 2018-06-21 2020-11-04 Cambridge Mechatronics Ltd Shape memory alloy actuation apparatus
KR102584971B1 (ko) * 2018-07-06 2023-10-05 삼성전기주식회사 카메라 모듈
KR102174152B1 (ko) 2018-07-09 2020-11-04 삼성전기주식회사 카메라 모듈
WO2020029821A1 (zh) * 2018-08-07 2020-02-13 宁波舜宇光电信息有限公司 摄像装置、sma驱动设备及制造方法、驱动方法和布线方法
CN111629125A (zh) * 2019-02-28 2020-09-04 宁波舜宇光电信息有限公司 摄像装置、sma驱动设备及其制造方法和驱动方法
GB2576362A (en) 2018-08-16 2020-02-19 Cambridge Mechatronics Ltd Improved crimping
GB201816544D0 (en) * 2018-10-10 2018-11-28 Cambridge Mechatronics Ltd Sma actuators for optical image stabilisation
KR102609149B1 (ko) 2018-10-15 2023-12-05 삼성전기주식회사 카메라 모듈의 제조 방법
KR20200042259A (ko) 2018-10-15 2020-04-23 삼성전기주식회사 카메라 모듈의 액츄에이터
KR20200055317A (ko) 2018-11-13 2020-05-21 삼성전기주식회사 카메라 모듈의 액츄에이터
GB201816864D0 (en) 2018-10-16 2018-11-28 Cambridge Mechatronics Ltd Electromagnetic screening of an image sensor from an actuator in a camera
KR102139770B1 (ko) 2018-11-05 2020-08-11 삼성전기주식회사 렌즈 모듈 및 이를 구비하는 카메라 모듈
KR102283083B1 (ko) 2018-11-13 2021-07-30 삼성전기주식회사 카메라 모듈의 액츄에이터
WO2020243860A1 (zh) * 2019-06-01 2020-12-10 瑞声光学解决方案私人有限公司 光学防抖镜头组件及其光学防抖的方法
US11258951B2 (en) * 2019-06-27 2022-02-22 Motorola Mobility Llc Miniature camera device for stabilized video using shape memory alloy actuators
CN110933266B (zh) * 2019-07-15 2021-12-21 华为技术有限公司 摄像装置、方法及调节元件
CN110727158A (zh) * 2019-09-11 2020-01-24 瑞声科技(新加坡)有限公司 镜头模组
CN110727122A (zh) * 2019-09-11 2020-01-24 瑞声科技(新加坡)有限公司 一种光学防抖组件
GB201919340D0 (en) 2019-12-26 2020-02-05 Cambridge Mechatronics Ltd Shape memory alloy actuation apparatus
GB201919339D0 (en) 2019-12-26 2020-02-05 Cambridge Mechatronics Ltd An actuation apparatus
JP2021107904A (ja) * 2019-12-27 2021-07-29 エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド レンズ駆動装置、カメラ及び携帯電子機器
GB2595646A (en) 2020-05-27 2021-12-08 Cambridge Mechatronics Ltd Actuator assembly
EP4158191A2 (en) 2020-05-27 2023-04-05 Cambridge Mechatronics Limited Actuator assembly
CN116349236A (zh) * 2020-07-15 2023-06-27 宁波舜宇光电信息有限公司 具有云台的摄像模组
GB2613757A (en) 2020-08-31 2023-06-14 Cambridge Mechatronics Ltd Actuator assembly
US11194115B1 (en) 2020-09-02 2021-12-07 Hutchinson Technology Incorporated Guided autofocus assembly
CN114253045B (zh) * 2020-09-23 2023-01-24 宁波舜宇光电信息有限公司 用于摄像模组的驱动装置、摄像模组及终端设备
CN114253044B (zh) * 2020-09-23 2023-07-28 宁波舜宇光电信息有限公司 用于摄像模组的驱动装置、摄像模组及终端设备
GB202015414D0 (en) 2020-09-29 2020-11-11 Cambridge Mechatronics Ltd Actuator assembly
KR20220051650A (ko) * 2020-10-19 2022-04-26 엘지이노텍 주식회사 카메라 장치
GB202019166D0 (en) * 2020-12-04 2021-01-20 Cambridge Mechatronics Ltd Actuator assembly
CN214540194U (zh) * 2021-03-12 2021-10-29 广东海德亚科技有限公司 镜头模组和电子设备
CN113923343B (zh) * 2021-04-29 2022-09-27 荣耀终端有限公司 驱动装置、摄像模组及电子设备
EP4348325A1 (en) * 2021-06-02 2024-04-10 Cambridge Mechatronics Limited Actuator arrangement
US11859598B2 (en) 2021-06-10 2024-01-02 Hutchinson Technology Incorporated Shape memory alloy actuators and methods thereof
GB2622985A (en) 2021-08-02 2024-04-03 Cambridge Mechatronics Ltd Actuator assembly
GB202117542D0 (en) 2021-12-03 2022-01-19 Cambridge Mechatronics Ltd SMA actuator assembly
GB202119163D0 (en) 2021-12-31 2022-02-16 Cambridge Mechatronics Ltd Actuator assembly
WO2023126632A1 (en) 2021-12-31 2023-07-06 Cambridge Mechatronics Limited Actuator assembly
GB2617179A (en) 2022-03-31 2023-10-04 Cambridge Mechatronics Ltd Actuator Assembly
GB202204749D0 (en) 2022-03-31 2022-05-18 Cambridge Mechatronics Ltd Actuator assembly
GB2621604A (en) 2022-08-17 2024-02-21 Cambridge Mechatronics Ltd Actuator assembly and method of assembling an actuator assembly
US11982263B1 (en) 2023-05-02 2024-05-14 Hutchinson Technology Incorporated Shape metal alloy (SMA) bimorph actuators with reduced wire exit angle

Family Cites Families (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6574958B1 (en) 1999-08-12 2003-06-10 Nanomuscle, Inc. Shape memory alloy actuators and control methods
JP2001142105A (ja) 1999-11-16 2001-05-25 Minolta Co Ltd 形状記憶合金を使用したアクチエータ
US6434932B2 (en) 2000-03-23 2002-08-20 Minolta Co., Ltd. Control mechanism with actuator employing shape memory alloy and method for adjusting servo control of the control mechanism
JP2002130114A (ja) 2000-10-20 2002-05-09 Toshiba Corp アクチュエータ装置
US6945045B2 (en) * 2001-10-01 2005-09-20 Minolta Co., Ltd. Driving apparatus
US7307653B2 (en) * 2001-10-19 2007-12-11 Nokia Corporation Image stabilizer for a microcamera module of a handheld device, and method for stabilizing a microcamera module of a handheld device
GB0128591D0 (en) 2001-11-29 2002-01-23 1 Ltd Mounting system
WO2005001539A1 (ja) 2003-06-27 2005-01-06 Nokia Corporation 形状記憶合金を用いたカメラレンズの位置決め装置及びこの位置決め装置を用いたカメラ
JP2006154345A (ja) * 2004-11-30 2006-06-15 Konica Minolta Holdings Inc 手振れ補正ユニットおよび撮像装置
GB0426331D0 (en) 2004-12-01 2005-01-05 1 Ltd Suspension system
JP4857550B2 (ja) 2004-12-06 2012-01-18 コニカミノルタホールディングス株式会社 駆動装置および駆動システム
JP2006178303A (ja) * 2004-12-24 2006-07-06 Konica Minolta Holdings Inc ぶれ補正装置
JP4682699B2 (ja) * 2005-05-26 2011-05-11 コニカミノルタホールディングス株式会社 駆動装置および駆動方法
JP4735060B2 (ja) 2005-06-06 2011-07-27 コニカミノルタオプト株式会社 駆動装置および手振れ補正システム
JP2007078954A (ja) * 2005-09-13 2007-03-29 Konica Minolta Opto Inc レンズ鏡胴及び該レンズ鏡胴を備えた撮像装置
JP2007139965A (ja) 2005-11-16 2007-06-07 Konica Minolta Opto Inc 駆動装置
GB2434214A (en) 2006-01-17 2007-07-18 1 Ltd Camera lens suspension
GB2451972B (en) 2006-03-30 2010-06-30 1 Ltd Camera lens actuation apparatus
US7773119B2 (en) 2006-04-28 2010-08-10 Konica Minolta Opto, Inc. Drive apparatus, image pickup unit and image pickup apparatus
JP2008040193A (ja) * 2006-08-08 2008-02-21 Nidec Copal Electronics Corp カメラレンズ
US7692689B2 (en) * 2006-08-23 2010-04-06 Konica Minolta Opto, Inc. Imaging-element unit and imaging device
KR100905236B1 (ko) 2006-09-29 2009-07-01 후지논 가부시키가이샤 이미지 블러링 보정 유닛, 이미지 블러링 보정 장치, 촬상장치, 및 휴대 기기
WO2008099155A1 (en) * 2007-02-12 2008-08-21 Cambridge Mechatronics Limited Shape memory alloy actuation apparatus
EP2111507B1 (en) * 2007-02-12 2011-03-30 Cambridge Mechatronics Limited Shape memory alloy actuation apparatus
JP2008203402A (ja) * 2007-02-19 2008-09-04 Konica Minolta Opto Inc センサ装置、および撮像装置
KR100846160B1 (ko) * 2007-03-27 2008-07-14 김형찬 자동 초점 조절 카메라 모듈 및 그 조절방법
WO2008129291A2 (en) 2007-04-23 2008-10-30 Cambridge Mechatronics Limited Shape memory alloy actuation apparatus
JP4952364B2 (ja) 2007-05-07 2012-06-13 コニカミノルタオプト株式会社 駆動ユニットおよび可動モジュール
JP4957366B2 (ja) 2007-05-09 2012-06-20 コニカミノルタアドバンストレイヤー株式会社 カメラモジュールおよびカメラモジュールの駆動方法
JP4946675B2 (ja) * 2007-07-05 2012-06-06 コニカミノルタオプト株式会社 形状記憶合金の駆動装置およびそれを用いる撮像装置ならびに形状記憶合金の駆動方法
JP5194622B2 (ja) * 2007-08-02 2013-05-08 コニカミノルタアドバンストレイヤー株式会社 駆動機構、駆動装置およびレンズ駆動装置
US8089694B2 (en) 2007-08-24 2012-01-03 Sony Ericsson Mobile Communications Ab Optical device stabilizer
CN101896719A (zh) 2007-10-30 2010-11-24 剑桥机电有限公司 形状记忆合金致动装置
US8077411B2 (en) * 2008-01-24 2011-12-13 E-Pin Optical Industry Co., Ltd. Lens displacement mechanism using shaped memory alloy
EP2326984A2 (en) * 2008-09-12 2011-06-01 Cambridge Mechatronics Limited Optical image stabilisation comprising shape memory alloy actuators
JP5465500B2 (ja) 2008-10-20 2014-04-09 日本電産サンキョー株式会社 振れ補正機能付き光学ユニット、および振れ補正機能付き光学ユニットにおける振れ補正制御方法
JP5223803B2 (ja) * 2009-07-21 2013-06-26 コニカミノルタアドバンストレイヤー株式会社 撮像装置
KR20110094723A (ko) * 2010-02-17 2011-08-24 삼성전기주식회사 렌즈 구동 엑추에이터 및 카메라 모듈
KR101148581B1 (ko) * 2010-11-03 2012-05-29 삼성전기주식회사 손떨림 보정 기능이 구비된 영상촬상 장치
KR101184812B1 (ko) * 2011-03-02 2012-09-20 삼성전기주식회사 손떨림 보정용 서스펜션 와이어 및 이를 포함하는 영상 촬상 장치

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109416498A (zh) * 2016-08-08 2019-03-01 剑桥机电有限公司 双照相机设备
CN110865499A (zh) * 2018-08-28 2020-03-06 三星电机株式会社 相机模块
CN111752068A (zh) * 2019-03-28 2020-10-09 日本电产三协株式会社 带抖动修正功能的光学单元
CN111752068B (zh) * 2019-03-28 2022-01-04 日本电产三协株式会社 带抖动修正功能的光学单元
CN111835942A (zh) * 2019-04-23 2020-10-27 华为技术有限公司 一种摄像头驱动装置、摄像头模组及移动终端
CN111835942B (zh) * 2019-04-23 2021-12-03 华为技术有限公司 一种摄像头驱动装置、摄像头模组及移动终端

Also Published As

Publication number Publication date
JP5702735B2 (ja) 2015-04-15
US20120019675A1 (en) 2012-01-26
WO2010089529A1 (en) 2010-08-12
JP2012517611A (ja) 2012-08-02
US8570384B2 (en) 2013-10-29
EP2394425A1 (en) 2011-12-14

Similar Documents

Publication Publication Date Title
EP2394425B1 (en) Optical image stabilisation
US8848064B2 (en) Optical image stabilization comprising shape memory alloy actuators
US9137429B2 (en) Camera apparatus
EP2732331B1 (en) Shape memory alloy actuation apparatus
US9753300B2 (en) Shape memory alloy actuation apparatus
EP2920955B1 (en) Control of an sma actuation apparatus
US9175671B2 (en) SMA actuation apparatus
US8866918B2 (en) Optical image stabilisation
JP5735991B2 (ja) Ｓｍａ作動装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110627

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20120518

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

RIC1 Information provided on ipc code assigned before grant

Ipc: H04N 5/225 20060101AFI20170102BHEP

Ipc: G02B 27/64 20060101ALI20170102BHEP

Ipc: H04N 5/232 20060101ALI20170102BHEP

INTG Intention to grant announced

Effective date: 20170126

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 898384

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170615

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602010042643

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170531

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 898384

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170831

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170831

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170930

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602010042643

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20180301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180129

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20180131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20100129

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170531

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170531

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602010042643

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: H04N0005225000

Ipc: H04N0023000000

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20221208

Year of fee payment: 14

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230530

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20240119

Year of fee payment: 15

Ref country code: GB

Payment date: 20240119

Year of fee payment: 15